Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Main {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new BackgroundPane());
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

class BackgroundPane extends JPanel {
    private BufferedImage bg;
    private int yOffset = 0;
    private int yDelta = 4;

    public BackgroundPane() {
        try {
            bg = ImageIO.read(new URL("http://www.java2s.com/style/download.png"));
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        Timer timer = new Timer(40, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                yOffset += yDelta;
                if (yOffset > getHeight()) {
                    yOffset = 0;
                }
                repaint();
            }
        });
        timer.start();
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(bg.getWidth(), bg.getHeight());
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();

        int xPos = (getWidth() - bg.getWidth()) / 2;
        int yPos = yOffset;

        yPos = yOffset;
        while (yPos < getHeight()) {
            g2d.drawImage(bg, xPos, yPos, this);
            yPos += bg.getHeight();
        }

        g2d.dispose();
    }
}